Power operated tabulating mechanism



Sept 3D, i958 R. D. DODGE 2,854,123

POWER OPERATED TABIIJLATING MECHANISM Original Filed May 8, 1952 6 Sheets-Sheet l Q RONALD D. DODGE ATTORNEY Sem. 30, i958 D. D. DODGE 2,854,123

POWER OPERATED TABULATING MECHANISM Original Filed May 8, 1952 6 Sheets-Sheet 2 fr Y Y fi- INVENTO'F- Y RONALD D, DODGE ATTORNEY FIGZ Sep 3, 158 R. D. DODGE 2,423

POWER OPERATED TABULATING MECHANISM Original Filed May 8, 1952 6 Sheets-Sheet 3 3 @D m LD um INVENTOR RONALD D. DODGE ATTORNY Sept. 3Q, E95@ R. D. DODGE POWER OPERATED TABULATING MECHANISM 6 Sheets-Sme?I 4 Original Filed May 8. 1952 iNYENTOR RONALD O "um D. DODGE Sept.. 30, 1958 R. D. DODGE POWER OPERATED TABULATING MECHANISM 6 Sheets-Sheet 5 Original Filed May 8, 1952 INVENTOR RONALD D. DODGE QW@ i?. /"dM www -ATToFeN EY Sept. 30, 1958 R. D. DODGE POWER OPERATED TABULATING MECHANISM Original Filed May 8, 1952 6 Sheecs-Shee'fl 6 nvm.

v om @D INVENTOR RONALD D, DODGE ATTORNEY United States arent() POWER OPERATED TABULATING MECHANISM Ronald D. Dodge, Poughkeepsie, N. Y.

Original application May 8, 1952, Serial No. 286,684 Divided and this application February 1, 1956, Serial No. 562,726

4 Claims. (Cl. 197-173) This application relates to a power operated tabulating mechanism and constitutes a division of an application led May 8, 1952, and bearing Serial No. 286,684.

A denominational tabulating mechanism, as disclosed and claimed in the aforementioned application, includes a plurality of counter stops, each of which may be individuallyv positioned for engagement by a column stop mounted on a typewriter carriage. A particular counter stop is selected by depressing a corresponding tabulator key, which action first raises the corresponding counter stop and then operates a universal bar which trips a cam actuated mechanism operative to eifect movement of the selected and now raised counter stop into the path of a preselected column stop on the carriage where it is held by an associated latching arrangement until engaged by the traveling column stop on the now released carriage. It has been discovered that a too rapid operation'or flicking of these tabulator keys will allow a selected counter stop to restore before the cam actuated mechanism is operative to effect movement of the raised counter stop into the path of the column stop and hold it there.

Accordingly, it is an object of this invention to provide a power operated tabulating mechanism wherein too rapid operation or flicking of the tabulator keys will not result in the faulty operation thereof.

The invention resides in the use of a latch mechanism operative to hold a counter stop in raised position until it passes under the control of the latching arrangement' associated with the cam actuated mechanism. This latch.

mechanism, of which one is provided for eachdenominational tabulating key and corresponding counter stop, latches up the associated counter stop as soon as it is raised by the initial downward movement of the assoelated key. It holds it in the raised position until the cam operated mechanism, which is tripped during final downward movement of the key, is operated to effect swinging movement of the counter stop. Thus, an immediate release of the depressed tabulating key will not affect the setting up of the counter stop as the counter stop will be prevented from restoring with the key by the latch mechanism. Advantageously, the latch mechanism holds only so long as needed: the cam actuated mechanism releasing it as soon as the latching arrangement takes over.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

ln the drawings:

Fig. l is a longitudinal section through a typewriting machine embodying the invention.

Fig. 2 is a fragmentary plan view of the machine shown in Fig. l with parts broken away to show the denominational tabulating mechanism.

Fig. 3 is a cross section through the machine taken substantially on the line 3-3 of Fig. 2.

'ice

Fig. 4 is a large scale vertical section of a portion of the machine taken on line ,-4 of Fig. 2.

Fig. 5 is an enlarged view of a portion of the machine shown in Fig. 2.

Fig. 6 is a rear elevational view of the portion of the machine shown in Fig. 5.

Fig. 7 is a large scale bottom view taken on the line 7 7 of Fig. 6.

Fig. 8 is an enlarged view, partly in section, of a portion of the machine shown in Fig. 1.

The invention disclosed in the drawings has been applied to a well known form of electrically driven power operated typewriting machine known commercially as the IBM Electric, the type bar operating mechanism of which is disclosed in Patent No. 2,506,444. lt will be understood, however, that the invention is not limited to embodiment in a typewriter of the form illustrated but may be embodied in other typewriters upon suitable modiiication of the various instrumentalities thereof.

As disclosed, the typewriter includes a base 10 upon which are fixed left and right side plates 12 and 14 rigidly connected at their ends to the adjacent ends of front and rear end plates i6 and 18 to form a rigid generally rectangular machine frame. A pair of rails 20 and 22 are disposed across the typewriter frame and secured at their ends to the side plates 12 and 14. The rails are provided with grooves or tracks upon which truck roller assemblies 24 are mounted to support a main carriage generally indicated by the reference numeral 26.

he carriage comprises plates 28 rigidly joined by a channel-shaped member 30 which is also grooved to receive and' movably support the carriage on the truck roller assemblies 24. A platen 32 is rotatably mounted on the carriage plates 28.

The carriage is also provided with the usual rack of column stops, generally indicated by the numeral 34, employed in tabulating operations and with the usual means for setting and clearing the stops, and these are described in detail in Patent No. 2,157,053. Briefly, the rack of column stops, hereinafter also designated as the tab rack, includes a bar 36 disposed at the rear of the carriage and attached at its ends to the plates 28 thereof. The bar is provided with a series of vertically aligned slots 38 on its front and rear faces and a column stop 4l) is rockably mounted on the shaft for movement in each of the slots. Each column stop is provided with a straight edge portion 40a positionable, as may be best seen in Figs. l and 4, in a raised or unset position and in a clockwise or set position in which the straight edge extends vertically. Each column stop is also provided with a lug 4Gb which cooperates with the corresponding prong .of a multiprong spring 42 to retain the stop in either of its positions.

The means for setting and clearing the stops include a special setting lever 44 for shifting the column stops from the unset to the set position and a clearing cam lever 46 for restoring said column stops to the raised position. The clearing cam lever 46 is fixed to a rotatable sleeve 48 mounted on a bracket 50 secured to the rear end plate 18 and this sleeve is connected through suitable linkage to a clearing key located at the keyboard. 'Ihe setting lever 44 is fixed to one end of a shaft 52 rotatably received in the sleeve and is connected at its other end by a suitable linkage to a setting key at the keyboard. Whenever the setting key is depressed it rocks the setting lever forward so that its head 44a engages a particular column stop, disposed in front of it by the position of the carriage, above its pivotal point so as to rock it clockwise as seen in Fig. 4 from the raised or unset position to the set position.

The clearing lever 46 has a cam portion 46a in the form of a V-shaped bend providing two cam surfaces designed toengage, the lug of the set stops. Whenever i it is desired to clear a. particularset stop,- .the stopY is positioned opposite the apex of the clearing key cam and the clearing key is depressed to rock the cam lever forward to engage the lug ofthe respective'columnstopiland rotate it counterclockwise. However, whenit is ldesired to vclear all ofthe'set column stops, all that is Inecessary is to hold the clearing key depressed whilethe carriage is moved across the machine,.for the'lateralmovement'lof the cam surfaces is eective `uponitlieslugffofheachfrsen column stop torotate it counterclockwise to itsvraised or unset position. t

Since the type bar operating power mechanism 'is now Ashaped portion 30 of the carriage and normally engages `a .tooth `1041/1 thereof. In- `thenormal position; the

:l opertively'disposed in Vthef'patlrr of each of the'typebars well known in the art, only. a very Abrief description there`:

58d are biased to a normal raised position bya spring j 66 reacting ,between the crossy bar 64 and each lever 58. i The powerV unit 55 Vfor each separate type barand its character key includes a'sublever 68. pivoted on `a cross rod`70 suitably mounted in the machine frame. The sublevers 68 'are retained in a normal position by means of springs 72" urging them in a counterclockwise direction as seen`in Fig! 1. Links 74'connect the sublevers'68 to the type bars'54'which are pivotally mounted in a well known way `on a curved fulcrum wire 76 in the usual segment 781- YIt'lis evident the normal position of the sublevers is determined. byfthe'engagement of the type bars with the usual curved 'type' rest 80;'

'I'hesublevers are rocked by the engagement' of operating'camsSZ mounted 'thereon with the power roller 56. These operating cams are' generallyv L-shaped in Vconstruction and are pivoted at 84. A' spring 86, attached at' one endl of 'the'cam and' at its other end` tothe `sub lever 678; biases Vthe-cam counterclockwise Vand acts to hold' a tread' bearing portion' 82a of the' cam out 'of` engagement with the power roller. An interposer 88 is pivotallyiand slidabl'ymounted on an extension 68a of each ,sublever and Vis biased'clockwise andto' the'ileftvinto which urges the cam clockwise until the tread of the vcam engages'the power roller 'rotating Vin the-direction of the arrow.VV 'Ihe-'tread-isv eccentric withrespect to thecam pivot 84; so-that rotation of the-cam urges the Vcam pivot tothe rightand-rocks the-sublever in aclockwise direction tov actuate the related type bar tothe printing position.

Subsequently, an extension 82f-of the cam will strike a'- pawl engages the rack to hold it vtired and is held by the rack at the limit of its movement in the letter spacing direction as determined by the engagement of the stud 100 Vwith an end of the slot 98a. v

The pawl is moved outof contact with the rack upon each striking of the type bar.V VA universal bar 106` is for rearward movement thereby. It is connected by a suitable link and"tr`i'p lever (bothnot showi1).withV the l pawl 'so as to rotate itl outY of engagementwithftlie iraclf@ when-the type bar is' struck.y However, once the-pawl is moved out of contact with the rack,'the springlm'ove's'it in a direction counter to therletter spacing direction until the stud 100 engages the otherV end 'of the slot 98a. At this point the paWl has been moved out of contact with the trip lever so thatthe pawl may re-engage the knext tooth onl the rack 'to-stop theicarriage--after'fit has advanced one lettervspace,T v v Vi Typewriters `*are ordinarily l furnished 'with :tabulating mechanisms of the non-denominational kindsuthfr as: that disclosedv in latentNo.v 1,935,436. YIn such-tabul'ating.v

-mechanisms, a tabulating key,.such as 108, is mountedf -on a lever 110 similar tothe'character key levers and" disposed at the left-hand endfofa'keyboard(Figl 2), The@ key directly controls a power unit operative to dispose a single counter stop in the path of alset'column stop; Itis a feature of this denominational tabulati11g-mech-y anism to retain the location of this tabulating keyfand its tabulating function for the convenience of operators v accustomed to the use of and perhaps intermittently using typewriters embodying the usual non-denominational tabulating mechanism, while incorporating. it into they Y new denominational tabulatingmechanism:n

VThe denominational tabulatngrmechanism lherein r dis?y closed enables direct tabulationof the carriage to any` of ten diierent typingpositions,y for every set column- Vstop. Itembodies the use of a bank fofrten counter- Vi lstops 112, each of. which is-positionable by Ya-correspond ing'ttabulating key during. the initial portion ofitsdepression. for movement into the path of a set column stop by a means controlled by power means actuated duringfthe-l h "tin'alportion of thekey depression. t

iinger stop 90 yandvby sliding along the finger stop will effect the positive disengagement ofthe cam-'from the power-roller.

The platen supportingcar'ri'age-26is-biased'formovef ment-in a letter spacingdirection.' A"spr'ing'motor; gen`= such movement. The spring motor-'isv mounted` onda-study 96carried bythe framework L'andnay Vvbe'of "theV type dis-1' closed in PatentNo. 2,157,053;

The bank of counter` stops 112 is rnountedin` a-car-v riage located in back of the rear carriage rail-2.2,V Thecarriagecomprisesa support member 114 having-:vertically aligned upper and. lower pairs Vof :laterally alignedgude portions 116 on its backside, and ashaft `118-ex. tending between'the lower-pair of the guide. portions.

EachicounterV stopis a generally flat` Y-shaped con-1 struction in which one branchportion 112b servesto engage a set column stop. and the other, 112e', serves to.,

engagethe means controlled by power means. Each isiformed with Va longitudinally extending. .slot in its Ybase` portion by.which they are assembledvin atwis relation upon the shaft 118 'ofthe carriage. Springs 120 react between lugs,112d formed on thelower end `of An escapement mechanism normally operates tolhold"V lug 98b thereof. ment rack 104 'iixed 'tothe under sideiof-"tle'channeleach counter stop and the corresponding prong, 122 of a'multipronged member 122'.secured to the lower portion ofthe back side` ofV the support member 114V to urge the counter stops downwardly and angularly onA the carriage until the upper end of their slots.l 11M rests ion the shaft 118 and the longer columnF stop-fengaging branch 11211 engages the `back 'side of the support member 114. In this'normal or inactive position a counter stop isdisposed out 'of the path'ofthe column stop, and as will beseen, will not beV swung thereinto upon the operation of the means controlled Yby 'power means for another counter 'stop' thathas been positioned.

The guide portions of each'laterallyaligned'paiare spaced apart the precise distance necessary tosnugly` but t slidably accommodate between; themn the counter'Av stops 112, which are one letterspace thicknessgand'f two'. spacer elements 1243 constructed generally similar to-each of the counter stops. The desirability for such spacer elements arises by way of the fact that there is no need that any of the ten typing positions be utilized for printing of the commas that separate the millionth from the hundred thousandth denominational order and the thousandth from the hundredth denominational order in numbers, since numbers are never started with commas. Thus by inserting the dummy counter stops or spacer elements between counter stops representative of the hundredth and thousandth denominational orders and between the hundred thousandth and millionth denominational order, the denominational tabulating mechanism, capable of tabulation to any of ten selected typing positions, will accommodate the printing of columns of numbers varying from amount positions of the hundred millions down through units to the decimal gures, as the printing of all decimal iigures is begun at the decimal point.

It should be noted that the spacer elements are biased by springs 120 in the same manner that the counter stops are. It has been found expedient to eliminate thereon the branch portion 112e found on the counter stops to insure that they will not be moved into the path of the column stop since they are not connected with any positioning mechanism which will exert sufcient additional drag to insure against their being raised, that is, positioned, by frictional contact with an adjoining counter stop that is being raised or positioned.

The counter stop carriage is slidably and yieldably supported upon the rear rail 22 for movement in a path parallel to that of the main carriage. A resilient U- shaped bracket member 126 is rmly secured, at the end of one of its legs, 126:1, to the rear rail 22 by a screw fastening 128 (see Fig. 3) and a dowel pin 130. The end of the other leg, 12611, of the U-shaped member is held to the rail by a screw fastening 132 of smaller diameter than the aperture through which it extends in the leg so that the leg may undergo yielding displacement. A spacer element 134 separates a frame member 136 from the movable leg 12617 of the bracket 126 and these three are united by rivets 138 into one integral unit. The frame member 136 is provided with three stud-like fastenings 136:1, and the counter-stop carriage is slidably supported on these fastenings by means of slots 114a formed in the support member 114. A spring 140 is connected at one end to the support member 114 and at its other end to a depending extension 1365 of the frame member, and urges the counter stop carriage in a direction counter to the letter spacing direction of the main carriage.

The keys for controlling the selective operation of each of the ten counter stops include the usual tabulating key 108 and a set of nine special keys 142 mounted in a row above the numeral row on the keyboard. Each of the special keys 142 is mounted upon the upper end of a key stem 144 slidably disposed in a slotted member 146 fixed to the machine frame. The lower end of each key stem 144.is forked and receives a pin 148 carried by one arm 150a of a bell crank 150. Each of the bell cranks 150 is pivoted on a transversely extending shaft 152 and is so mounted that its other arm 15017 extends downwardly.

It is a feature' of this denominational tabulating mechanism that the special or denominational keys 142 are arranged in the same sequence as the typing positions determined by their operation appear at the striking point of the machine. This result has been obtained by inversely connecting the bell cranks of the nine special keys with the nine right-hand counter stops (Fig. 2). Each bell crank has its depending arm 1501) offset from its horizontally extending arm 15001 by a bail-like extension 151kl which rigidly interconnects them. As best seen in Fig. 2, the bell cranks for the keys 100M, 10M, 1M, and l00T; representative of the 100,000,000; 10,000,000; 1,000,000 and 100,000 denominational o1'- ders; are each provided with a bail-like extension which disposes their depending arms 150b to the right and inversely of their key order. Similarly, the bell cranks for the keys 10T, 1T, 100, 10 and 1; representative of the 10,000; 1,000; 10 and unit denominational orders are each provided with a bail-like extension disposing their depending arms to the left and inversely of their key order.

The usual tabulating key 108 is connected with the left-hand counter stop, that is, the one that allows the main carriage to travel all the way to the decimal point before it is stopped, by a bell crank 154 likewise mounted on the shaft 152. An arm 15411 has its free end disposed in the path of a lug l10n formed on the key lever for counterclockwise rocking thereby. The depending arm 154b is similar to the depending arms 150b of the bellcranks for the special keys and is also offset from the arm 154:1 by a bail-like extension 154C but only to dispose it adjacent the depending arms 15`0b.

Each of the bell cranks and 154 is operatively connected with the corresponding counter stop for the respective key to raise the counter stop when the key is depressed. A link 156 extends rearward from a pivotal connection with the lower end of each of the depending arms of the bell cranks to where it is connected with the depending arm 153er of the bell crank 153 pivotally mounted on a shaft 160 carried by a bracket 162 mounted on the rear end wall 18 of the machine frame. Each bell crank 158 is provided with a horizontally extending arm 1581; having a ball and socket connection with the lower end of a link 164 pivotally connected at its upper end at 166 with the lower end of the corresponding counter stop 112. 1t will be evident that when a tabulating key is depressed, the corresponding bell crank 150 or 154 is rotated counterclockwise to pull a link 156 forwardly and rock the corresponding bell crank 158 counterclockwise so that its horizontally extending arm 1581; shoves a link 164 upward and raises the corresponding counter stop 112 to position it.

After the selected counter stop 112 has been positioned, the means controlled by a power means is brought to bear upon it. The means controlled by a power means includes a bail member 168 biased for movement from a normal position into engagement with the shorter branch 112C of a raised counter stop 112 to move the branch 112]) into the path of a column stop, an operating lever 170 biased to a normal position in which it holds the bail member in its normal position, and a cam unit, generally indicated at 172, connected with the operating lever to move it from its normal position to release the biased bail member.

The bail member 16S is supported on the counter stop carriage. It comprises a generally U-shaped construction having its legs pivotally mounted on the shaft 118 so as to dispose its bight portion slightly above the notches formed between the branches 112]: and 112c of the counter stops when the counter stops are in their normal positions. The bail member is biased for movement from normal position by a spring 174 reacting between an extension 16851 of one of the arms of the bail member and an inturned portion of the U-shaped prong member 122 secured to the rear side of the support member 114. It will be observed that the clearances between the bight portion of the bail member and the upper edges of the shorter branches 112C of the counter stops in their normal positions are sufcient to permit movement of the bail member without disturbing the counter stops. However, when a counter stop has been raised, the shorter branch member 112e will be disposed in the path of movement of the bight portion of the bail member with the result that the bail member, when released to move under the iniiuence of its spring 174, will swing the raised counter stop about the shaft 118 to dispose the longer branch 112b thereof in the path of a set column stop. When the bail member 16S restores to normal position,A the forwardedgerof 'its bightl portion may engage'the rearward edgerof theflonger .branch portionl12b and assist the corresponding springl v120 in 'swinging the counter'stop clockwise: Springs 214 andV 196 may assist1the-sp1ing-120 andthe gravitationalforces in restoring thecounter stopand the associated key linkage tomormal position.V A projection-112e is -formed'on the' end of the shorter counter stop branch 112e toengagethe upper-surface of KVthe bail member and Vprevent restoration of the counter stop when the tabulatingkey is released by an operator before the bailrnember is restored to -normal position.

Theoperating lever 170v is supported for horizontalto the rear end Vplatef18 vandacts tobias the lever to its normal position.k Y

Thev operating lever V170 acts to hold the bail member 168 in its normal position bymeans of a one-way connection; A stud 170e is xed to the underside of the operating lever and cooperates with a `muchlarger generally rectangular hole 168]: :formed in the bight portion of the bail member 168. The stud and the hole are so positioned that when Athe operating lever is moved Ato its normal-position, the studengages the forward side of the hole to move the bail member to its normal position and hold it there out of the upward paths taken by shorter branches 112C when the counter.V stops are posi? tioned. On the other hand, the Vhole is of Ysuch'depth that when the operatinglever is moved from its normal position by the power unit, it willnot be engaged by the. stud during its operative movement; Hence, the bail member moves. under the influence of its own biasing spring 174 when it is released, and shoulda column stop be positioned directly opposite a selected counterv stop,

no damage will occur byrreason of the forceful opera-A tion of the power unit. The spring 174 exerts a yielding force which delays completing the movement of the selected counter Vstop into the pathy of the set column stops until the column stop engaged by the counterstop during outward movement has moved beyond the counter stop. The rectangular shape of the hole accommodates movement of the counter stop' carriage relative'rto the operating lever.

Thel power unit 172-is operative to move the operating lever 170 from its normal position a distance suicient to allow the bail member'168 to move a raised counter stop into the path of a set column stop. VIt is driven, when actuated, by the continuously rotatable power roller 56 and -for this reason'is pivotally mounted ona nearby stud 178\fixed to the machine framework. It` includes an elongated frame member 180, arotatable cam 182, a biased arm 184, and a trip lever 186. The frame member 180 is formed out of spaced plates riveted yto form a rigid unit and is pivoted on the stud 17S'xed to the framework. The frame member has an extended portion 186e: having a shaft V186b on which a single-lobe cam 182 is rotatably mounted. A pin 182a projects laterally from one side ofthe cam and is so located with respect to the recessed portion 182b of the cam as to be engaged when the recessed portion is disposed toward the power roller, by the biased arm 184 extending beneath the cam shaft 18019 from a pivot pointvona second shaft 180C carried by the frame member 180. The arm is biased toward'the cam shaft by a torsion' spring 188 coiled around the shaft 180C and hooked to lugs formed in the arm and in the frame member.

The trip lever 186 controls the operation of the power un-it. This lever, while disposed on thev side of the cam 182. opposite that` of the.. arn11184, iszlikewisepivotally mounted on the -shaft 180e` armnowurges thel cam further inthe samedirectiont;

surface 182:1Y oftthezcamnwith'thesurface of theU-power roller 56. The continuouslyl rotating power rollerzthen-4 drives theV cam through Vapproximately one revolutiorr. until theV recessed portion-18% is again disposed toward it. vAt this timeV thepin'182c is stopped byl the outer-luga.v 186b if the tripV lever has not been restored to its normal:v

position andby the inner lug 186af-if-thc lever has been on the pins 182:1. e

,The power unit is made. operative to shift then-operan.H inglever 170 by making theytreadportion 182d. of ther.v cam eccentric with respect `to thefcam: shaft i180b. Thus;l .Y

when the camf is jrotated, it-actsjto shift theshaft-lsbf.

springA 176;

The power' unit is-actuated'duringY the final portion. of the depression `of a tabulating` key to vinsure thatfthei corresponding counter `stop has already; been positioned. To this end, a lostfmotionconnection is provided: be;-V tween Vthetrip lever 186 and each `key stem 144- so that the initial portion ofv'the Vtotal movementv permitted each..

key stembythe -notchedportion -144a of the'stemacts only` to position the counter stop, A common power unit Yactuating Vmember 192 is pivotally mountedvonia shaft 194 carried by the framework and Vis provided with prongs 192e engageablef by offsets 144b formed in the respective key stems. The common power unit actuating member 192 is biased. upward by aspring 196 reacting., between a boss 192b formed-thereon'and a'lug'198 xed.

to the machine Vframework'towarda stop member 146a constituting anextension ofthe` slotted member` 146;

The stop member 146v disposes the member 192l Vsol that its prongs 192aareV engaged'by the otfsetsr1`44b of the key stems only afterthe latter have undergone: some1 movement. takes place before the member 192 is depressed to rock the trip lever`v 136 througha connecting link 200 so as to move the trip lever lugV 18611 towardvthe cam shaftf `18011 to release the cam 182 and .operate the power unit.

ltwill be evident that spring 196 acts to-restore'the trip lever as well as the actuating'memb'er 192fwhen the key'is released.

path of downward movement of lug bformed on theilever4 110..` A sufficient distance is-providedbetweem so that Aits-.freev end-.extendsL beneath'the-'cam-shaft 180bt This endisprovided-.with` thetwooifsetlugs,.186aand 186b spaced radiallyand, langul'arly ofA eachother,v withfrespect to' the camshaft. 186b so:y astobealternately disposed in ,the path of afpinVA 182C projectingglaterally from that sidey ofl thecame.'` ".[hisY pin. 182e is -sorelatedto the p in 182e onwthe other.Y side Ofthecam-that. when;` one or theother of theflugai. engagesit, it willY stop `therotation'of the camtwhenI ther: pin- 182a has depressed thearm and moved pasta deadu. center relationship witheitl to aposition in-whichtheffY In this way the Vcounter stop positioning',

the normal positions for the lug and the prong to ac-rv commodate the positioning of the corresponding counter stop before the power unit is actuated.

A latch mechanism, generally indicated by the numeral 202, is associated with each of the counter stop positioning means to prevent the return of a raised counter stop before the operating bail is released. This problem arises when the key is icked, that is, depressed and released very rapidly, or is struck so hard as to cause the counter stop to overthrow and attempt to rebound to its original position.

As best seen in Figs. 1 and 8, each latch mechanism 202 includes a latch member 204 pivoted at one end by a suitable fastening 266 to the depending arm 154b of the respective bell crank 159, a bail member 208 pivotally mounted -on a Xed shaft 210 and operatively connected to the power unit, and a guide vane 212. The latch member 204 is biased upward toward the bail member and the guide vane by a spring 214 reacting between a lug 204e on it and -a lug 216 on a fixed part of the machine frame and is provided with an extension 2Mb having a step portion 204C and a second extension 20AM terminating in an upwardly directed hook portion 204e having a flat upper edge and a generally vertical side edge. The step portion 2Mo of the latch member normally engages the bottom side of the bail member 208 under the action of the spring 214. The latch bail 208 is formed of a transverse member having bent over parallel end plates 20go pivotally mounted on the shaft 21@ and an arm 2081) pivotally connected by a link 211 with an extension 18de of the power unit frame member 180. The guide vane 212 is pivetaliy mounted on the same shaft 219 and is biased in a rearward direction by a spring 213 reacting between a lug 212e formed on it and a lug 220 fixed on a portion of the machine frame toward a fixed stop 222. The vane is formed with a series of downwardly extending prongs 212b for engaging the hook-shaped portion 204e of the latch member.

When a bell crank 150 is rocked to raise a counter stop, the latch member is pulled forward so that the stepped portion 204C no longer is disposed beneath the bail member but in front of it where it acts to prevent return movement of the latch member and hence to hold the bell crank out of normal position and in a condition in which the corresponding counter stop is held raised. At the same time that the latch member was displaced, the vane was swung forward away from its stop 222 against the action o-f its spring 218 by the forward vertical edge of the hook portion 264e of the latch member.

The bell crank is unlatched only after the power unit 172 has been operated. When the power unit is operated, the lower extension 189e of the frame member is swung backward and thro-ugh the link 211 acts upon the arm 298i: of the bail member 298 to swing the bail member downward. This downward swinging of the bail member 208 effects a downward swinging of the latch member 2434 against the action of the spring 214. When the latch member has been swung to a point where the flat upper edge of the hook portion Zte is beneath the lower edge of the corresponding prong 21217 on the guide vane 212, the vane restores to its normal position in engagement with the stop 222 and disposes the prong above the fiat upper edge of the hook portion. Thus, when the power unit restores to its normal position and rocks the bail member 208 upward, the latch member does not follow because of the engagement of the guide vane by the upper edge of the hook portion. As soon as the bail member has been raised above the surface of the step portion 264C, the latch mechanism 2312 is unlatched since the latch member will be held out of contact with the bail member until the upper edge of the hook portion slides olf the guide vane prong. Restoration of the latch member and the corresponding tabulating key under the action of the latch member spring 214 and the counter stop spring will be delayed, however, until the lip 112d of the selected counter stop is disengaged from the biased bail member 168.

The movable mounting of the support member 114, constituting the counter stop carriage, furnishes the means by which a selected counter stop 112 is held in the path of a set column stop until after engagement by it. The means includes a latching mechanism for temporarily preventing the means controlled by a power means from restoring to its normal position after it has moved a positioned counter stop into the path of a set column stop.

As shown, the latching mechanism is obtained by making one end 17017 of the operating lever T-shaped and providing a cooperating slotted member 224 on the support member 114. The slotted member is firmly, though adjustably, mounted on the support member by screws 226 so that its bifurcated portion extends rearwardly and to the right to receive the forwardly extending portion 170e of the operating lever. When the operating lever is in normal position, the forward portion 170C of its T-shaped end 17% extends through the slotted member and is engaged on its left side edge by a non-slotted por tion of the slotted member. ln this manner the counter stop carriage is held in its normal position against the reaction of its spring 140, and the normal position of the operating lever is determined by the engagement of the body portion of the T-shaped end of the operating lever with the bottom of the slot in the slotted member. Movement of the operating lever from its normal position withdraws the forward portion 170e from the slot a distance sumcient to clear its left side edge of the non-slotted portion of the slotted member and enables the counter stop carriage to move to its advanced position. The operating lever is now prevented from returning to its normal position under the action of the spring 176 by the engagement of the front edge of the forward portion 170C with the bottom of the slot in the slotted member.

It will be remembered that the selected counter stop remains in the path of a set column stop as long as the biased bail member 16S is not returned to its normal position. Hence, as long as the operating lever is held out of its normal position` because of the advanced position ofthe counter stop carriage, the selected counter stop will remain in the path of set column stop.

The operating ever is restored to its normal position when the counter stop engages a set column stop. The momentum of the main carriage causes the column stop to move the counter stop carriage through its normal position until it is stopped by the engagement of the studs 136e on the frame member 136 with the ends of the slots 114:2 in the support member. This movement of the counterstop carriage withdraws the non-Slotted portion of the member 22d from in front of the front edge of the forward portion 170C of the operating lever and allows the operating lever to restore to normal position. As pointed out hereinbefore, this action restores the means controlled by a power means to normal position and allows the selected counter stop to do the same. The counter stop carriage will be held in normal position again by the engagement of the non-slotted portion of the member 224 with the left side edge of the forward portion 176C of the operating lever.

The carriage is released for an excursion in a letter spacing direction concurrently with the swinging of the selected counter stop into the path of a set column stop. To do this, the `operating lever 174) is connected with the escapement mechanism provided for the typewriter. As best seen in Fig. 5, a compound lever 228, secured by a screw fastening 23? to the lateral extension 136e of the frame member 13e, is pivota ly and slidably connected by a slot 22811 formed in one end thereof to a stud 232 fixed on the operating lever 170. The other end of the compound lever is pivotally connected to a link 234. The link is slotted at 2341: in its other end to receive a stud y 236'-ixed"on"a horizontal: portion extendingbeneaththel" rear` carriage-'rail 22 .ofaflever 238 pivoted at one end to` the top of the rail by a stud-like fastening-24g The? other end'of thelever 238 is formed with an ear Y238:1

which, projects` upward into the pathY of-'movement of the.

toothedf'escapement pavvlI 98` so that when the-lever 238y is-.swung about its pivot 240-the= escapement pawlris withdrawn; from the escapement rackf104. Uponthev withdrawal of Ithe escapement pawl` by the movement of operatingllever 170ffromnormal position, the carriage isv moved' under vthe impetus. imparted to it by the tape 94 connected to the springmotor 92 until it is stopped Vby theienga-gement of a setfcolumnfstop'withf a-counter stop disposedin` the path' of thezcolumn stop; Theescapement pawlf restoreswhen'the operating lever restores..

Irrithe. interest ofhigh speed typing operations, it is desirablei that .a tabulatingv operationV becompletedl as rapidlyvasipossible.. To accomplish this, it is necessary that thef main carriage26 be permitted to. attain a reason` riage=v after the counter stop carriage.V has been moved to its limitingposition in aletter spacingfdirection against thewbias of its spring 140 by the main, carriage. Thees.-

capement mechanism, in thel event that-the counter stop.

has restored, will prevent further movement of thez main. carriage inV the letter spacing directiongshould it reboundy from the rebound mechanism. n

VThe novel rebound mechanism includes a toothed .pawl 242v-loeated^behind the rear carriage rail 22 and a'iixed rack- 244 carried by the main carriage on the bottom of the tab rack 34. The pawl 242 ispivota'lly mounted onafstud-like fastening 246fsecured to the top -of azsecondolateraltextension 136d of the frame memberf136. secured upon therear rail 22 by the U-shaped bracket` 126.V Y Y Thel toothed pawl 242 is urged toward .engagement with'fthe'rack 244 by a spring 243l reacting between an arm 242a formed integrally with the tooth pawl .and the lug. 250:1l ofa bracket 25% secured by screws 252 upon thecoun-ter stop carriage H4.. A second lug 250b 'dependsrfrom the bracket 250 into thepath of movement'V ofthe arm 242g and acts toV hold the pawl 242 out of engagement with therack while the counter stop carriage is in or between its'normal and advanced'positions. However, when the counter stop carriage is moved past the normal position from the advanced position bythe action of a setcolumnstop upona selected counter stop, the spring 248 causes the arm of the pawl to follow the lug until the toothed end of the pawl` engages the rebound rack. Thus, if the main carriage bounces backward, it will be prevented from moving to another typing position by the engagement of the rebound paWl With1the. rack. After the rebound pawl has stopped `the main carriage, it will be moved out of contact therewith by the .action of the counter stop carriage restoring to its normal position.

A. governor may be provided to prevent the main carriage from attaining excessive velocities during the-relatively long excursions Vinvolved in the tabulating operation. It may. be of the type disclosed in Patent No.

2,353,095 and include a ratchet wheel 254which normally rotates freely with the spring motor 92 but when; it is` held against rotation, it exerts a brakingforcegupon. the motor, materially'decreasing the impetus applied; byV

it to the carriage.

Thegratchet wheel 254 is heldV against rotation during the tabular. operation by the action of theoperating lever. 170.: A bell-.crank 256 iszpivotally mounted on a studV 2581 (Figst 3'andYA 6) secured? to themachine frame-andY` i belll'fcrankawithf onearm 262a offa three-armlever 262*LV pivoted ona'stud 2645 secured to the machine frameworkQ 'I`heft'hree-arrn'` lever 262-is biased by ai spring 2'661-in1a counterclockwise direction, as seen in Fig. 3,v to-'apositionVv in which it holds the upstanding arm 256:1.ofA the bell crank.y inf the pathlof movement of the operating-lever;

A detent 268 for the ratchet wheelis formed withl a;

longitudinally extending slot 268a at one end by'which itispivotally and slidably mounted onthe same'stu'd 2645011 which the threearm lever 262 is mounted. The other end of the detent is provided with anl L-shapedf detent into engagement with the ratchet wheel.` A spring 272 is interposed between a lug V268d formed on` the detentland anV aperture in the third' arm 262e` of the three-y arm lever and urges the detent'so that the stud 270 on` the second arm of the three-arm lever rests in the bend of the L-shaped slot 268b1 and the stud 264 secured to the ,framework rests in the inner end of the longitudinally formed; slot; VWhen thethree-arm lever 262 is rotatedthrough the; bell crank 256 bythe movement of 'the oper-V atingleverl fromv normal position, the bent-over lug 268cm? ,thedetent is moved into engagement with a tooth Y therewith is such that the ratchet wheel is allowed to turnZ` a toothspace o r twoV before it is nally stopped byl the pinand the stud striking the` upper ends ofthe slots-in" the detent. Thisallows a few letter spaces of movement` ofthe main carriagebefore any braking eect'is exertedffand takes care of extremely shorty tabulating movements in-'Which it is'desired' not to have the main carriage retarded to vany extent. 1

Itmay happen that one of the tabulating keys isdepressed when no column stop has been setor after a set column stop has already moved past the correspondingcounter stop` for the operated key. In such` an eventl there will be an excursion of the carriage until Vthe usual margin stop .mechanism provided in the typewriting-.ma-'4 chine effects a stopping `of the carriage movement. It isl a featureof this denominational tabulating mechanismto utilize this stoppingl action of the margin mechanism to effect a restoration `of the counter stop carriage and the selected counterstop to their normal positions..

The margin stop mechanism of the type shown includes elements mounted on the carriage and elements mounted on the framewhichcooperate .with each other to determine the limits of movement of the carriage upon the rails. A margin stop rack.274 is .provided onthe carriage so as to be above the rear carriage rail 22 and is provided with right and left-hand margin stops 276 and f shaped bracket 126 and the frame member 136 in aspacek occurring above the spacer member 134, The `drag link.

280 is also provided with a rearwardly extending lstud 280cand a spring 283 urges it in a direction counter to the'letter spacing direction to a nor-mal position.

A'link 284' connects'the drag link with the counter stopl cariiage.- The link` is formedY at one end With a longitudinally extending slot Y284er in'whichV the drag link stud 280cis slidably received. The other end of the.

link is pi-votally connected-'to a studn 286 xedto the Y counter stop carriage. The location and length of the slot 284m in the link 284 is such that the counter stop carriage movements do not disturb the drag link in normal position. It follows that the drag link stud 280C normally occupies an intermediate position in the slot 234:1 and that when the counter stop carriage is in an advanced position the stud is adjacent the left-hand end of the slot. Thus, when the right hand margin stop encounters the laterally extending portion 280a of the drag link 280 and moves it the length of its slot 280b against the bias of the spring 283, the stud 230e will engage the left-hand end of the slot 28441 to move the counter stop carriage only when the counter stop carriage is in advanced position. As soon as the drag link has moved the counter stop carriage to its normal position, the operating lever 170 is unlatched and restores the bail member 16S to normal position, permitting the selected counter stop to do likewise. It will be evident that this movement of the counter stop carriage has the same effect as the movement of it by the engagement of the column stop with the counter stop.

A typewriting machine is usually provided with a back space mechanism operative upon each actuation to move the platen supporting carriage one space in a direction counter to the letter spacing direction. In the embodiment disclosed, the mechanism includes a pawl 288 for engaging the escapement rack 104 and shifting it and the main carriage in a direction counter to the letter spacing direction. The pawl 288 is pivotally mounted upon a stud 29@ carried by a slide 292 and has its toothed portion urged toward the rack by the spring 102 which also urges the escapement pawl 9S into engagement with the escapement rack. The slide 292 is connected by a link 294 to a lever 296 pivotally mounted on the bottom of the rear rail 22, and the slide is urged in the letter spacing direction to a normal position by the action of a spring 293 upon the lever 296 tending to rotate the lever in a counterclockwise direction as seen in Fig. 2. The lever 296 is operatively connected to power operated back spacing mechanism (not shown). The depression of the back space key causes the mechanism to effect a rocking of the lever 296 and a shifting of the slide 292 to the right. The back space pawl 288 is normally held from engagement with the rack by a boss 300 lixed relative to the rear rail 22. This boss is slidably engaged by the tooth portion of the pawl which also acts as a cam to hold it out Iof contact with the escapement rack when the slide occupies its normal position. When the slide is moved from the normal position in a direction counter to the letter spacing direction, the toothed portion of the pawl 283 is moved away from the boss and rotates into engagement with the escapement rack under the action of the spring 102.

To prevent the elective operation of such a back space pawl during the tabulating operation, an interlock is provided between it and the operating lever 170. A U- shaped member 302 is slidably .supported beneath the rear rail 22 by a xed headed fastening 304 received in its longitudinal slot 36201. One leg 302b of the U-shaped member terminates in a laterally extending portion 362C which is slotted at 302d to form a lost motion connection with a stud 3436 carried by the rearwardly extending portion 17M of the T-shaped end 17tlb of the operating lever. The other leg 392e of the U-shaped member 302 extends upward into the path of swinging movement of an extension 288er formed on the back space pawl 288. Normally, the leg 392e of the Uashaped member is held out of the path of swinging movement of the back space pawl extension 288a by the engagement of the stud 306 with the forward end of the slot 302d; but when the operating lever is moved from normal position, the stud 3%, after a limited amount of free movement, engages the rear end of the slot 302d and moves the leg 302e into the path of swinging movement of the pawl. Thus,

ld if the back space pawl ZSS is movedfree of the stud 390 by the power operated back spacing mechanism while the operating lever is out of normal position, the leg 392e of the U-shaped pawl will permit translation of the pawl with the slide 292 but no rotation thereof into engagement with the rack.

It will be remembered that the main carriage is moved in a letter spacing direction across the carriage by the action of the spring motor 92 upon the tape 94 connected to the carriage. The main carriage may be returned across the frame of the machine over the bias of the spring motor by a mechanism substantially like that described in Patent No. 2,157,053. It will suice to state here that when a carriage return key (not shown) on the keyboard is depressed, a cam unit, generally similar to the cam unit 172 for the tabulating mechanism, is rendered operative to engage a carriage return clutch and at the same time rock a clutch knockout or trip lever 308 from a normal position to a position in the path of the left-hand margin stop 273 through the medium of a link 310. The trip lever 30S is vertically mounted at an intermediate point on a stud-like fastening 312 and is connected to the link 310 at its lower end.

In order to permit the tabulating operation to take precedence over the carriage return `operation in the case of `accidental simultaneous depression of one of the tabulating keys 108 or 142 and the carriage return key, or in the case of the depression of the carriage return key while the tabulating operation is taking place, an interlock is provided. The interlock mechanism is mounted on the bottom of the lateral extension 136C of the `frame member 136 and may be best seen in Fig. 7. KIt consists of a series of levers and links operatively connecting the operating lever 170 with the lower end of the clutch knockout or trip lever 308. A bell crank 314, pivoted on :a stud-like fastening 31S depending from the lateral frame member extension 136C, has `one of its arms 314m provided with a slotted end in which is slidably disposed a stud 315 carried by the operating lever. The other arm 314b of the bell crank is pivotally connected to one end of a link 318, the other end of which is pivotally connected on an intermediate portion of a lever 320. The end of the lever 320 is slotted yand receives, the pin 322a of a member 322 slidably mounted by a pair of longitudinally extending slots 322k on a pair of stud-like fastenings 324 fixed to the lateral extension 136C. The slide member 322 is formed with a lateral extension 322C movable into the path of movement of the lower end of the clutch knockout or trip lever 308. It results that when the operating lever 170 is rotated by the power unit 172, the slide 322 is shifted to a position in which it moves and/cr holds the knockout lever in a clutch knockout position, thus stopping or preventing the operation of the carriage return mechanism.

An interlock is also provided to insure that the rebound pawl 242 is held out of engagement with the rebound rack 244 during the power operated carriage return operation. By interposing a lever 32641 in the clutch knockout lever link 310, it is possible to move the rebound pawl, should it be in an operative position, from that position and to hold it in an inoperative position during the carriage return operation. The lever 326g is pivotally mounted on a stud 328 fixed on the extension 13617 of the frame member 136 and constitutes one arm of a bell crank 326 (Fig. 3), the other arm 326i] of which is movable into the path of an extension 242i; (Figs. 2 and 3) of the rebound pawl 242. Since the knockout link 310 is always shifted in a direction counter to the letter spacing direction to rotate the clutch knockout lever to a raised position when the carriage return mechanism is actuated, the lever 3:26a of the bell crank is also always rocked during the carriage return operation to swing the arm 326b. If the rebound pawl is in engagement with the rebound rack, the rebound pawl extension 242b will be engaged by the swinging arm 3261 and shifted to a Y 15 positionin which the toothedend of, the rebound ,pawl is clear ,ofV the rack;

` While there have been shownnand described andtpointed outtherfundamental novel features of the invention as .applied toa preferred embodiment, it will be understood that various omissions and substitutions and changes in the form and details of' the device illustrated andV in its operation maybe made by Ithose skilled in the art, without departing from the spirit of the invention. -Itis the intention, therefore, to be limited only as indicated by the scope of the following claims.

What is claimed is:

l. In atypewriting machine or the like, a main car- V Iiage having a column strop and biased for movement in Y a'letter spacing direction, Aan escapement mechanism for controllingthe letter spacing movement of said mainv car- =riage, power means, `a series of tabulating counter stops each positionable'for movement by said power means into Y the path of the column stop to intercept it and dispose the carriage in a typing position diierentfromI :that-effected by each Vof the other counter'V stops, a corresponding series of tabulating keys, meansoperable upon the initial movement of each of said tabulatingl keys to position-the corresponding counter'v stop,k latch meansfassociatedwith to actuate said power means, and means operable by said power means'to actuate the escapement mechanism;V

2. -In a-tabulating mechanism, power means,- acounter Ystop positionable for movement by said power means int-o thev path of a column stop, a key for operating4 said" counter'stop, means operable upon the initialmover'nent'- of said key to position said counter stop, a latch ymember Y movable with said positioning means from-aV normal position to a displaced position, Ian, assembly,` including anelement movable by the power means operableto retain the -latch member in displaced position untilthe Y power means is operated, and means operable upon fur-ther movement of the said key to actuate the power means;k Y

3. In combination, means controlled by oscillatable power means, a keeper member rockableto and; from a normal position Yby said means controlled-by oscillatable power means, a biased lever'movable from a normal position to dispose an element for'operationf by said meansy controlledby oscillatable power means, a latch member pivotally connected with said lever for movement therewith andk having its free end biased toward said keeper member,v said keeper member being operable to retain said latch member in a displaced condition and tokswing said latch member about its pivoted connection with said biased lever, and a guide member rockable by said latch member fromv a normal position to which it is biased and releasable to the normal position when the latch memberV is swung by said keeper member, said guide member after restoration to normal position being operatively position. ,l t

42' In a typewriting or like machineincludinga letter.- spacingv direction `,biased platen supporting carriagev havdisposedjinjthe path of swinging movement oftsaid latch member to disconnect saidl latch member from the keeperY member ,when the keeper member is restored` to normaly able with arack on said carriage, reboundfpreventing,A

mechanism includinga rebound pawl engageable with a rebound rack ,on said carriage anda power operated cal-A riage return mechanism having al control linkage, a secondcarriage biased for movement from a normal positionw to an advanced position, a seriesA of tabulating, counter stops mounted on saidV second' carriage in side by sideV contact and` slidable independently of each other to a' positionin which theymay be swung into .the path of the column stop, a correspondingseries of tabulating keys, linkage operable upon initial' movement of'eacli key to slide the correspondingcounter stop to they swinging position, a biased bail* member operablowhen Vreleasedrfrom a normal position to swing the raised'c'ounter: stop into thepath of 'the column stop and when restored tov swingit back out` of" said path, an operating lever for said bail member biased to a normal position inwhich` it lholds the bailimember in normal position, a cam operated power unitn to move said operatinglever-V from its normal position, cooperating latch means on saidoperatof-'normalV position when thesecond carriage is in the, l advanced position, linkage operablel `upon movement;I of,

thel operatingleverV from normal position to actuate the` escapement mechanism, linkage operable upon movement ofsaid:V operating -lever from normal position yto block said backspace -paw1 from engagement Withesaid-'rackgV linkage yoperable upon-movement ofA said operating lever 'from normal positionto hold the control linkage forr the,

power operated carriagereturn mechanism infanjinactive condition, cooperating latcht means associatedV with` saidcounter stop-sliding linkage and said `cam operatedwpower" unit to hold the' slid counter stop inthe swingable position untilthe power unit is operated, linkage meansY operable upon further movement-ofthe lrespective key to actuate saidcam operated power unit, and linkage operable-uponthe actuation ofthe control linkage'tor the carriage return mechanism to vhold'the rebound -pawl 'Y out of engagement withthe rebound rack.

References Cited in the le of this patent-i UNITED STATES PATENTS Pitman Dec. 25, 1951 

